CN110526797A - A kind of method and apparatus that steam cracking device depressurizes gasified raw material carbon four and recycles cooling capacity - Google Patents
A kind of method and apparatus that steam cracking device depressurizes gasified raw material carbon four and recycles cooling capacity Download PDFInfo
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Abstract
The invention belongs to chemical fields, and in particular, to a kind of method and apparatus that steam cracking device depressurizes gasified raw material carbon four and recycles cooling capacity.This method comprises: four heated after depressurisation of material carbon is gasified, the cooling capacity of material carbon four is recycled, the material carbon four after heating and gasifying enters gas downstream pyrolysis furnace after compressor boosting, heating.Method of the invention can meet the steam consumption that integrated artistic is substantially reduced while downstream cleavage furnace import requirement.
Description
Technical field
The invention belongs to chemical fields, and in particular, to a kind of steam cracking device depressurizes gasified raw material carbon four and recycles
The method and apparatus of cooling capacity.
Background technique
As the raw material of preparing ethylene by steam cracking becomes more diverse, since light component raw material has yield of ethene height, price
Cheap, the features such as energy consumption of unit product is low, thus the light components such as ethane, propane, butane hydro carbons increasingly become cracking dress
The important source material set.
How according to the physicochemical characteristics of light raw material more sufficiently, more reasonably utilize light hydrocarbon feedstocks, be to improve second from now on
The key of alkene device benefit.
Four raw material of carbon is usually transported to steam cracking device in the form of room temperature (20 DEG C), liquid, when as cracking stock,
It is 700kPaG or so that pyrolysis furnace entrance, which requires (1) pressure, and (2) phase is gas phase.Carbon four needs to be heated to 68 at this pressure
DEG C or more can all gasify, for guarantee operation stability, need at least overheat 5 DEG C, that is, need carbon four being heated to 73
℃。
In preparing ethylene by steam cracking device, the preferred heat medium of low temperature position is usually 83 DEG C of chilled water (chw), gasification 100
Ton/hour four raw material of carbon needs 977 ton/hours of chilled water (chw), and heat exchanger chilling water outlet temperature is 70.7 DEG C.Fig. 1 is using anxious
Load-temperature curve of the gasification heat exchanger of cold water carbon four, it will be noted from fig. 1 that guarantee middle carbon four in gasification heat exchanger
The minimum heat transfer temperature difference (folder point) of raw material and chilled water (chw) is not less than 5 DEG C, it is necessary to use a large amount of first order chilled water (chw).
When whole device raw material is whole lighter, the chilling water balance of full device is nervous, needs to gasify using low-pressure steam
Carbon four.Under the same terms, four raw material of carbon of 100 ton/hours of gasification needs to consume 20.88 ton/hours of low-pressure steam of 150 DEG C.
Fig. 2 is load-temperature curve of the gasification heat exchanger of low-pressure steam carbon four, as can be seen from Figure 2 between low-pressure steam and carbon four
Heat transfer temperature difference it is very big, minimum heat transfer temperature difference be 77 DEG C, there are huge heat wastes.
Summary of the invention
The purpose of the present invention is overcoming the drawbacks described above of the prior art, a kind of steam cracking device decompression gasified raw material is provided
Carbon four and the method and apparatus for recycling cooling capacity.This method and device can be significant while meeting downstream cleavage furnace import requirement
Reduce the steam consumption of integrated artistic.
To achieve the above object, the first aspect of the present invention is to provide a kind of steam cracking device decompression gasified raw material carbon four
And the method for recycling cooling capacity recycles the cooling capacity of material carbon four, heating this method comprises: four heated after depressurisation of material carbon is gasified
It is discharged after the boosted heating of material carbon four after gasification.
The second aspect of the present invention is to provide a kind of steam cracking device decompression gasified raw material carbon four and recycles the dress of cooling capacity
It sets, which includes:
Decompressing unit, for depressurizing material carbon four；
Gasification and cryogen subscriber unit carry out heating and gasifying for the material carbon four after depressurizing, while recycling material carbon
Four cooling capacity；
Boosting heating unit, for the material carbon four after heating and gasifying to be carried out boosting heating.
Effect of the invention is: the preparing ethylene by steam cracking device based on lightweight material, chilling area disk oil and chilled water (chw)
When insufficient, it is necessary to consume a large amount of steam heating and gasifying material carbon four, by taking 100 tons of four raw materials of carbon that gasify as an example, need to consume low
20.88 ton/hours of steam of pressure.By 200 yuan/ton, calculated within the operating time in year 8000 hours, year consumes 33,400,000 yuan of steam.Using this
Four raw material of carbon of the method for the proposition of invention, the equivalent that gasifies can provide 12 DEG C of cooling capacity 10.0MW or 28 DEG C of cooling capacity
10.69MW, the pressure recompressed to pyrolysis furnace entrance 700kPaG are respectively necessary for consumption work done during compression 2466kw or 1726kw.By every
0.4 yuan of degree electricity calculated for the operating time in year 8000 hours, and power consumption is respectively 7,890,000 yuan or 5,520,000 yuan.
Other features and advantages of the present invention will then part of the detailed description can be specified.
Detailed description of the invention
Exemplary embodiment of the invention is described in more detail in conjunction with the accompanying drawings, it is of the invention above-mentioned and its
Its purpose, feature and advantage will be apparent, wherein in exemplary embodiment of the invention, identical reference label
Typically represent same parts.
Fig. 1 is four gasifier load of prior art chilled water (chw) carbon-temperature curve；
Fig. 2 is four gasifier load of prior art steam carbon-temperature curve；
Fig. 3 is the flow chart of the embodiment of the present invention 1；
Fig. 4 is the flow chart of the embodiment of the present invention 2；
Fig. 5 is the flow chart of the embodiment of the present invention 3；
Fig. 6 is the flow chart of comparative example 1；
E1 user's gasifier 1, E2 bypass gasifier, E3 user's gasifier 2, four superheater of E4 carbon；
D1 knockout drum；
C1 compressor, one section of C1-I compressor, two sections of C1-II compressor.
Specific embodiment
The preferred embodiment that the present invention will be described in more detail below with reference to accompanying drawings.Although showing the present invention in attached drawing
Preferred embodiment, however, it is to be appreciated that may be realized in various forms the present invention without the embodiment party that should be illustrated here
Formula is limited.On the contrary, thesing embodiments are provided so that the present invention is more thorough and complete, and can will be of the invention
Range is completely communicated to those skilled in the art.
The present invention provides a kind of method steam cracking device decompression gasified raw material carbon four and recycle cooling capacity, this method packet
It includes: four heated after depressurisation of material carbon is gasified, recycle the cooling capacity of material carbon four, the boosted heating of material carbon four after heating and gasifying
After be discharged.Gas downstream pyrolysis furnace can be entered after discharge.
Material carbon four is depressurized by regulating valve first, and pressure reduction, temperature reduce, due to its corresponding saturation under the state
Temperature reduces, and so as to be gasified in lower temperature, reduces gasification difficulty.Preferably, by the pressure reduction of material carbon four
To 10-400kPaG.
After the decompression cooling of material carbon four, into gasifier, in the gasifier, material carbon four is heated gasification, and heats
Medium temperature reduces, to recycle the cooling capacity in material carbon four.The heat medium of the heating and gasifying can be 30-85 DEG C of Jie
Matter, preferably device technique medium or public work medium.
According to the present invention, boosting is preferably realized by compressor, and the material carbon four after heating and gasifying can be directly entered pressure
Contracting machine, or compressor is entered with 1 DEG C or more of the degree of superheat via superheater.
Gas-phase carbon four after gasification enters compressor, and pressure rise after compression, temperature raising are sent to gas downstream and cracked
Furnace.Wherein, the condition of the boosting heating is that pressure rises to 450-1200kPa, and temperature rises to 65-105 DEG C.
According to the present invention, liquid phase remaining after heating and gasifying is sent into liquid cracking furnace after being pressurized.
With the difference of four flashing pressure of carbon, the cryogen level that the cooling capacity of the recycling material carbon four is capable of providing is 2-60
DEG C, preferably 12-28 DEG C, for supplying at least one cryogen user, the cryogen user has identical or different cryogen grade
Position demand.
For the different requirements of the cryogen user of the different levels of matching, material carbon four can undergo once or more
Vacuum flashing makes its temperature be reduced to the requirement for meeting cryogen user to temperature.Carbon four after gasification respectively enters compressor
Corresponding pressure level is compressed.Preferably, in 10kPaG between 250kPaG, the second stage pressure exists the first stage pressure
100kPaG is between 1200kPaG.
When cryogen user is not enough to gasify all four raw materials of carbon, heating bypass can be set, such as followed using cheap heat source
The media such as ring water, chilled water (chw), gasify residual carbon four, and the carbon four after gasification goes the corresponding level pressurization of compressor.
A kind of preferred embodiment according to the present invention, method of the invention specifically comprise the steps of, as shown in Figure 3:
(1) material carbon four depressurizes, as pressure is down to 50 to 150kPaG；
(2) four temperature of carbon after depressurizing is reduced to 12 to 28 DEG C；
(3) carbon four after depressurizing enters gasifier, and heat medium is processing medium or other public work media；
(4) gasification of carbon four can provide the cooling capacity of 12 to 28 DEG C of levels for user.
(5) four component of carbon to gasify enters compressor, is pressurized to gas pyrolysis furnace required pressure；
(6) remaining liquid heavy constituent is by entering liquid cracking furnace entrance after pump pressurization.
A kind of preferred embodiment of the present invention is as shown in Figure 5, which comprises material carbon four divided for two streams,
First strand of logistics heated after depressurisation gasifies to the first level, recycles the first level cooling capacity, obtains gas phase I-1 and liquid phase
I-1, the gas phase I-1 go to two sections of compressor, and heated after depressurisation gasifies the liquid phase I-1 again, recycle the second level cooling capacity,
It obtains gas phase I-2 and liquid phase I-2, the gas phase I-2 enters two sections of compressor after going to one section of compressor compression；
Bypass gasifier is gone to after second burst of logistics decompression, gas phase II is obtained and liquid phase II, the gas phase II goes to compression
Two sections of machine；
Compressor second stage exit gas is sent to gas pyrolysis furnace；
Liquid cracking furnace is sent to through pressurization after the liquid phase I-2 and liquid phase II merging.
Another kind preferred embodiment of the invention is as shown in Figure 4, which comprises divides material carbon four for three strands of objects
Stream,
First strand of logistics heated after depressurisation gasifies to the first level, recycles the first level cooling capacity, obtains gas phase A and liquid phase A,
The gas phase A goes to knockout drum；
Knockout drum is gone to after second burst of logistics decompression；
Bypass gasifier is gone to after third stock logistics decompression, gas phase B is obtained and liquid phase B, the gas phase B goes to gas-liquid separation
Tank；
The isolated gas phase C of the knockout drum and liquid phase C, the gas phase C go to two sections of compressor, the liquid phase C
Through decompression and heating and gasifying, the second level cooling capacity is recycled, gas phase D is obtained and liquid phase D, the gas phase D goes to one section of compressor pressure
Enter two sections of compressor after contracting, compressor second stage exit gas is sent to gas pyrolysis furnace；
The liquid phase A, liquid phase B and liquid phase D through pressurization are sent to liquid cracking furnace after merging.
Wherein, the heat medium of the bypass gasifier is recirculated water or chilled water (chw).
The second aspect of the present invention is to provide a kind of steam cracking device decompression gasified raw material carbon four and recycles the dress of cooling capacity
It sets, which includes:
Decompressing unit, for depressurizing material carbon four；
Gasification and cryogen subscriber unit carry out heating and gasifying for the material carbon four after depressurizing, while recycling material carbon
Four cooling capacity；
Boosting heating unit, for the material carbon four after heating and gasifying to be carried out boosting heating.
Preferably, when gasification is not enough to gasify whole material carbons four with cryogen subscriber unit, which further includes heating
Bypath system.
By following embodiment, the present invention will be described in more detail.
Embodiment 1
As shown in figure 3, material carbon four is depressurized through regulating valve, then gasify in user's gasifier 1E1, remaining liquid phase is sent to
The cracking of liquid furnace；After gas phase is compressed to 700kPaG or so by compressor C1, temperature is increased to 72 DEG C and enters gas stove cracking.
Design parameter is as follows: if (1) four raw material of carbon is depressurized to 50kPaG, the saturation temperature of four raw material of carbon is 12 DEG C,
The cooling capacity of 12 DEG C of levels can be provided for user.(2) if four raw material of carbon is depressurized to 150kPaG, the saturation temperature of four raw material of carbon
It is 28 DEG C, the cooling capacity of 28 DEG C of levels can be provided for user.
Embodiment 2
As shown in figure 4, it is three strands that material carbon four, which divides, first burst of logistics goes to user's gasifier after being decompressed to 150kPaG
1E1 provides the cooling capacity of 28 DEG C of levels for user, and user's gasifier E1 gas phase goes to knockout drum D1；Second burst of logistics decompression
After go to knockout drum D1；Bypass gasifier E2 is gone to after third stock logistics decompression, bypass gasifier E2 gas phase goes to gas-liquid
Knockout drum D1.The pressure of knockout drum D1 is controlled in 150kPaG or so, and knockout drum D1 gas phase goes to two sections of compressor
C1-II, knockout drum D1 liquid phase are decompressed to 50kPaG again, provide 12 DEG C of levels in user's gasifier 2E3 for user
Cooling capacity.User's gasifier 2E3 gas phase goes to one section of C1-I of compressor, is compressed to after 150kPaG and from knockout drum D1's
After gas phase is converged, into two sections of C1-II of compressor, it is sent to gas stove cracking after being compressed to 700kPaG, temperature is 72 DEG C at this time.
User's gasifier 1E1, bypass gasifier E2, user's gasifier 2E3 liquid phase converge after through pressurization be sent to liquid furnace.
Embodiment 3
As shown in figure 5, it is two strands that material carbon four, which is divided to, first burst of logistics goes to user's gasifier after being decompressed to 150kPaG
1E1 provides the cooling capacity of 28 DEG C of levels for user, and user's gasifier 1E1 liquid phase object flows away user's gasifier 2E3, user's gasifier
1E1 gas phase goes to two sections of C1-II of compressor；Bypass gasifier E2 is gone to after second burst of logistics decompression, bypasses gasifier E2 gas phase
Go to two sections of C1-II of compressor.After user's gasifier 1E1 liquid phase stream is decompressed to 50kPaG, used in user's gasifier 2E3
Family provides the cooling capacity of 12 DEG C of levels.User's gasifier 2E3 gas phase goes to one section of C1-I of compressor, is compressed to after 150kPaG and comes
From user's gasifier 1E1, bypass gasifier E2 gas phase converge after, into two sections of C1-II of compressor, after being compressed to 700kPaG
It is sent to gas stove cracking, temperature is 72 DEG C at this time.Bypass gasifier E2, user's gasifier 2E3 liquid phase converge after through pressurization give
Toward liquid furnace.
Comparative example
As shown in fig. 6, steam heats direct gasification material carbon four.Material carbon four gasifies in user's gasifier 1E1, heating
Medium is chilled water (chw) or the heat sources such as low-pressure steam or material.Remaining liquid phase is sent to the cracking of liquid furnace；Gas phase is by four superheater E4 of carbon
After heating, it is sent to gas stove cracking.
Need to consume low-pressure steam 20.88 by taking 100 tons of four raw materials of carbon that gasify as an example using the process of comparative example 4
Ton/hour.By 200 yuan/ton, calculated within the operating time in year 8000 hours, year consumes 33,400,000 yuan of steam.
According to method described in 1-3 of the embodiment of the present invention, four raw material of carbon for the equivalent that gasifies can provide 12 DEG C of cooling capacity
10.0MW or 28 DEG C of cooling capacity 10.69MW, the pressure recompressed to pyrolysis furnace entrance 700kPaG are respectively necessary for consumption work done during compression
2466kw or 1726kw.By every 0.4 yuan of degree electricity, calculated within the operating time in year 8000 hours, power consumption is respectively 7,890,000 yuan or 552
Wan Yuan.
It consumes as shown in table 1 below:
Table 1
| Flashing pressure | 50kPaG | 150kPaG |
| Cooling capacity level is provided | 12℃ | 28℃ |
| Cooling capacity MW is provided | 10.01 | 10.69 |
| Recompress pressure | 700kPaG | 700kPaG |
| Recompress power | 2466kw | 1726kw |
| Year operating cost | 7890000 yuan | 5520000 yuan |
Steam direct heating operating cost is 33,400,000 yuan/year, as seen from the above table, compared with steam direct heating, this hair
Bright method substantially reduces the steam consumption of integrated artistic, while the present invention provides and is lower than conventional chilling coolant-temperature gage level (32 DEG C)
Cooling medium, with highly significant economic benefit.
Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes are obvious for the those of ordinary skill in art field.
Claims (10)
1. a kind of method that steam cracking device depressurizes gasified raw material carbon four and recycles cooling capacity, which is characterized in that this method comprises:
Four heated after depressurisation of material carbon is gasified, the cooling capacity of material carbon four is recycled, after the boosted heating of material carbon four after heating and gasifying
Discharge.
2. according to the method described in claim 1, wherein, by the pressure reduction of material carbon four to 10-400kPaG.
3. according to the method described in claim 1, wherein, medium that the heat medium of the heating and gasifying is 30-85 DEG C.
4. according to the method described in claim 1, wherein, the condition of the boosting heating is that pressure rises to 450-1200kPa, temperature
Degree rises to 65-105 DEG C.
5. the material carbon four after heating and gasifying is straight according to the method described in claim 1, wherein, boosting is realized by compressor
It taps into compressor, or compressor is entered with 1 DEG C or more of the degree of superheat via superheater.
6. according to the method described in claim 1, wherein, the cryogen level that the cooling capacity of the recycling material carbon four provides is 2-60
DEG C, for supplying at least one cryogen user, the cryogen user has identical or different cryogen level demand, it is preferable that
Material carbon four is repeatedly depressurized, and to meet different cryogen level demands, the material carbon four after heating and gasifying respectively enters compression
The corresponding pressure level of machine is compressed.
7. according to the method described in claim 1, wherein, which comprises material carbon four is divided for two streams,
First strand of logistics heated after depressurisation gasifies to the first level, recycles the first level cooling capacity, obtains gas phase I-1 and liquid phase I-1,
The gas phase I-1 goes to two sections of compressor, and heated after depressurisation gasifies the liquid phase I-1 again, recycles the second level cooling capacity, obtains
Gas phase I-2 and liquid phase I-2, the gas phase I-2 enter two sections of compressor after going to one section of compressor compression；
Bypass gasifier is gone to after second burst of logistics decompression, gas phase II is obtained and liquid phase II, the gas phase II goes to compressor two
Section；
Compressor second stage exit gas is sent to gas pyrolysis furnace；
Liquid cracking furnace is sent to through pressurization after the liquid phase I-2 and liquid phase II merging.
8. according to the method described in claim 1, wherein, which comprises material carbon four is divided for three bursts of logistics,
First strand of logistics heated after depressurisation gasifies to the first level, recycles the first level cooling capacity, obtains gas phase A and liquid phase A, described
Gas phase A goes to knockout drum；
Knockout drum is gone to after second burst of logistics decompression；
Bypass gasifier is gone to after third stock logistics decompression, gas phase B is obtained and liquid phase B, the gas phase B goes to knockout drum；
The isolated gas phase C of the knockout drum and liquid phase C, the gas phase C go to two sections of compressor, and the liquid phase C is through subtracting
Pressure and heating and gasifying recycle the second level cooling capacity, gas phase D and liquid phase D are obtained, after the gas phase D goes to one section of compressor compression
Into two sections of compressor, compressor second stage exit gas is sent to gas pyrolysis furnace；
The liquid phase A, liquid phase B and liquid phase D through pressurization are sent to liquid cracking furnace after merging.
9. a kind of steam cracking device depressurizes gasified raw material carbon four and recycles the device of cooling capacity, which is characterized in that the device includes:
Decompressing unit, for depressurizing material carbon four；
Gasification and cryogen subscriber unit carry out heating and gasifying for the material carbon four after depressurizing, while recycling material carbon four
Cooling capacity；
Boosting heating unit, for the material carbon four after heating and gasifying to be carried out boosting heating.
10. device according to claim 9, wherein when gasification is not enough to gasify whole material carbons with cryogen subscriber unit
When four, which further includes heating by-pass unit.
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| CN201810505067.9A CN110526797B (en) | 2018-05-24 | 2018-05-24 | Method and device for gasifying carbon four as raw material through decompression of steam cracking device and recovering cold energy |
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| CN2732743Y (en) * | 2004-09-17 | 2005-10-12 | 西安长庆科技工程有限责任公司 | Light hydrocarbon recovering integrated device |
| CN1962576A (en) * | 2005-11-11 | 2007-05-16 | 中国石油化工股份有限公司 | Method for producing propylene ethane by carbon-containing olefin catalytic cracking |
| CN101092323A (en) * | 2006-06-21 | 2007-12-26 | 中国石油化工股份有限公司 | Method for preparing olefin in lightweight by catalytic cracking olefin of containing carbon |
| CN103936542A (en) * | 2013-01-23 | 2014-07-23 | 中国石油化工集团公司 | Alkene catalysis cracking system and method for improving alkene total conversion rate |
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2018
- 2018-05-24 CN CN201810505067.9A patent/CN110526797B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2732743Y (en) * | 2004-09-17 | 2005-10-12 | 西安长庆科技工程有限责任公司 | Light hydrocarbon recovering integrated device |
| CN1962576A (en) * | 2005-11-11 | 2007-05-16 | 中国石油化工股份有限公司 | Method for producing propylene ethane by carbon-containing olefin catalytic cracking |
| CN101092323A (en) * | 2006-06-21 | 2007-12-26 | 中国石油化工股份有限公司 | Method for preparing olefin in lightweight by catalytic cracking olefin of containing carbon |
| CN103936542A (en) * | 2013-01-23 | 2014-07-23 | 中国石油化工集团公司 | Alkene catalysis cracking system and method for improving alkene total conversion rate |
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